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= README for eRuby

== What's eRuby?

eRuby interprets a Ruby code embedded text file. For example, eRuby
enables you to embed a Ruby code to a HTML file.

== Required environment

* Ruby version 1.6.x or later.

== Installation

(1) Type `./configure.rb' to create Makefile.
    (Type `./configure.rb --help' to get a help message.)

(2) Type `make' to compile eRuby.

(3) Type `make install' to install all files.

== Syntax

A Ruby block starts with `<%' and ends with `%>'. eRuby replaces
the block with its output.

  $ cat foo
  Hello, <% print "World!" %>
  $ eruby foo
  Hello, World!

If `<%' is followed by `=', eRuby replaces the block with a value
of the block.

  $ cat bar
  Hello, <%= "World!" %>
  $ eruby bar
  Hello, World!

If `<%' is followed by `#', the block is ignored as a comment.

  $ cat baz
  Hello,<%# this is
  a comment %> World!
  $ eruby baz
  Hello, World!

If a line starts with '%', eRuby evaluates the line as a Ruby
program and replaces the line with its output.

  $ cat quux
  % x = 1 + 1
  1 + 1 = <%= x %>
  $ eruby quux
  1 + 1 = 2

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